KR101047849B1 - Anaerobic digester with gas circulations in opposite directions and of stream swirling type and method thereof - Google Patents

Abstract

PURPOSE: A reverse direction gas circulating and flow path swirling type anaerobic digesting apparatus and a method for the same are provided to save cost required for heating a digesting bath by heat-exchanging low temperature organic wastes and high temperature organic wastes. CONSTITUTION: A reverse direction gas circulating and flow path swirling type anaerobic digesting apparatus includes a first temperature controlling unit(120), an inlet tube(100), a double tube pipe(110), an inflow water circulating pipe(260). The first temperature controlling unit maintains organic wastes in a digesting unit at the optimal temperature. The inlet tube introduces the organic wastes from the first temperature controlling unit. The double tube pipe functions as the introducing path and a heat exchanger. The inflow water circulating pipe allows the organic wastes to be swirled at the bottom part of the digesting unit.

Description

Anaerobic Digester with Gas Circulations in opposite directions and of Stream Swirling Type and Method

The present invention relates to an anaerobic digestion apparatus and method for extinguishing organic waste. More specifically, the temperature control device is installed in the inlet pipe and the internal return pipe flowing into the anaerobic digester to increase the heat exchange efficiency when the organic waste enters the anaerobic digester and circulates the organic waste deposited in the bottom of the digester. Anaerobic digestion apparatus of the structure which can improve agitation efficiency by providing vortex induction plate so that organic waste and digestion gas can be forcibly vortexed by maintaining the internal temperature at optimum state and re-injecting the generated digestion gas into digester; It relates to an anaerobic digestion method.

In the anaerobic digester, organic waste agitation is characterized by sufficient contact between influent and microorganisms, uniform physical, chemical and biological reactions in the digester, rapid diffusion of metabolites or inhibitors, dilution of inhibitors, and formation of scum layers on the surface. This is very important to prevent the accumulation of suspended solids in the lower part of the digester.

If the digester is not stirred, organic waste is deposited in the lower part of the digester. The organic wastes have high gas concentrations such as organic acids and carbon dioxide, which inhibits the activity of anaerobic microorganisms, so that they can be uniformly dispersed in the digestion tank by stirring or dilute and dissolved in the spent organic wastes. In addition, since anaerobic microorganisms are sensitive to temperature changes, it is necessary to keep the internal temperature of the digester uniform by stirring to keep it as constant as possible.

The agitation of anaerobic digester includes gas stirring and mechanical stirring.

In the mechanical stirring method, according to the existing patent 10-0982690, the technique using the existing rotary propeller was attempted to improve the stirring efficiency of the digester by the vertical stirring device through the linear reciprocating motion of the impeller, and to the patent 10-2010-0086751 According to the present invention, the sludge circulation path was installed at one or more places along the outside of the digester, and the sludge was circulated along the circulation path with an agitator therein to improve the stirring efficiency of the digester. Mechanical stirring method requires a large power for agitation to increase the operating cost of the digester, there is a problem that the stirrer mounted in the digester is corroded.

Gas stirring method according to the existing patent 10-0982690 was to inject digestion gas into the connection pipe installed vertically downward in the center of the digester and to extinguish the digester by discharging the digestion gas while rotating the lower discharge pipe, according to Patent 20-0325105 It was intended to agitate the digester by releasing digestion gas from the rotating tube in the anaerobic digester.

In the gas stirring method, a sufficient amount of gas must be supplied to agitate the organic waste in the digester, but it is difficult to secure a sufficient gas supply in proportion to the size of the digester. In addition, in the usual gas agitating device, the pressure is difficult to reach not only the digester bottom but also the wall, and thus organic waste is deposited and adhered to the digester bottom and the wall. Due to this phenomenon, it is difficult to completely mix in the digester, and thus there is a problem that the digestion efficiency is lowered.

The present invention prevents the accumulation of suspended solids in the lower part of the digester, and anaerobic microorganisms are sensitive to temperature changes, so that the temperature of the organic waste in the digester can be kept constant by agitation of the internal temperature of the digester by stirring.

A first temperature control device 120 for controlling the temperature to maintain the organic waste at the optimum temperature; And an inlet pipe 100 for introducing the organic waste passed through the first temperature control device into the digester; And a double tube pipe 110 serving as a heat exchanger at the same time as the inflow passage of the organic waste introduced from the outside through the inflow pipe. And an inflow water circulation pipe 260 for allowing organic waste to vortex at the bottom of the digester at the bottom of the double tube pipe; And a first gas supply pipe 160 and a second gas supply pipe 170 for extracting the extinguishing gas for reverse rotation of the digester and re-injecting the gas in the reverse direction. And a vortex induction plate 130 for generating a vortex when the digestion gas is supplied to the first gas supply pipe and the second gas supply pipe in a reverse direction. And internal settling tank 210 to increase the microbial residence time in the upper end of the digester and to discharge the supernatant water; And a circulation pipe 220 capable of forcibly circulating and stirring the organic waste precipitated in the bottom of the digester. And a second temperature control device 240 for controlling a fine temperature to maintain a digester at an optimal temperature in the circulation pipe. The digestion gas includes only one of the gas supply pipes of the first gas supply pipe or the second gas supply pipe. The problem can be solved by the anaerobic digestion apparatus, which is characterized by causing mutual reverse rotation by injecting.

In addition, the present invention, in the anaerobic digestion method of organic waste, the first temperature control step (S1) for adjusting the temperature to maintain the organic waste at the optimum temperature; And introducing the organic waste that has passed the first temperature control step into the digester (S2); And heat exchange of the organic waste introduced from the outside through the double tube tube (S3); And vortexing organic waste at the bottom of the digester at the bottom of the double tube tube (S4); And re-injecting the digestion gas through the gas supply pipe of any one of the first gas supply pipe and the second gas supply pipe in the digestion tank by extracting the digestion gas for mutual reverse rotation in the digestion tank (S5). And vortex generation step (S6) for generating a vortex when the re-injected digestion gas is supplied in a reverse direction to each other; And internal settling step (S7) to increase the microbial residence time at the upper end of the digester and to discharge the supernatant water; And a circulation and stirring step (S8) capable of forcibly circulating and stirring the organic waste precipitated at the bottom of the digester. And a second temperature control step (S9) for adjusting the fine temperature in the circulation and stirring step to maintain the digester at the optimum temperature; can solve the above problems through anaerobic digestion method comprising a.

In the anaerobic digester of the present invention, organic waste can be stirred without a dead zone, and when the digested gas is injected into and out of the double tube tube, the direction in which the organic waste is vortexed is changed, so that the mixed organic waste and the digested sludge are mixed in the digester. It is possible to uniformize the temperature, and there is no separate mechanical part inside the digester, which makes maintenance easy and saves energy and maintenance costs.

In addition, it is possible to save the digestion tank warming ratio by exchanging high temperature pretreated organic waste with organic waste which is relatively low temperature through the temperature control device, and install an internal settling tank on the upper part of the digester. ) Can be increased to improve the extinguishing efficiency.

In addition, the present invention is to shorten the digestion time by improving the stirring efficiency, it is possible to produce a stable and efficient digestive gas.

1 is a view showing the movement direction of organic waste during the injection of the digestion gas in the digester double tube tube 110 appearance according to the present invention.
2 is a view showing the movement direction of the organic waste when the digestion gas injection into the inner tube of the digester double tube tube 110 according to the present invention.
3 is a view showing the vortex induction plate 130 provided in the digester according to the present invention.
4 is a view showing an influent water circulation pipe 260 provided in the digester according to the present invention.
5 is a view showing the internal settling tank 210 provided in the digester according to the present invention.
6 is a cross-sectional view taken along the line AA ′ of FIG. 1.
Figure 7 is an illustration of the anaerobic digestion method of organic waste according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the flow of the digestion gas flows into the double tube tube 110 appearance upstream and the downward flow in the inner tube of the double tube tube 110, the overall circulation occurs.

Figure 2 shows the flow of the upstream flow of the digestion gas flows into the inner tube of the double tube tube 110, the flow of the downward flow occurs in the outer tube tube 110, the overall circulation occurs. 3 is a cross-sectional view showing a vortex induction plate 130 according to the present invention. In addition, Figure 4 is an enlarged view of the influent water circulation pipe 260 of the present invention. 5 is an enlarged view of the internal precipitation tank 210 of the present invention.

1 and 2, the flow passage vortex type anaerobic digestion apparatus through the gas alternating stirring according to the present invention is a double tube tube 110, the first temperature control device 120, the vortex induction plate 130, influent water circulation The pipe 260, the internal precipitation tank 210, the first gas supply pipe 160, the second gas supply pipe 170, and the second temperature control device 240 are provided.

First, the double tube tube 110 serving as a heat exchanger at the same time as the organic waste flows through the first temperature controller 120 and the organic waste introduced from the outside through the inlet pipe 100, the double tube The inlet water circulation pipe 260 is provided at the lower end of the pipe 110 so that the introduced organic waste moves while generating a vortex at the bottom of the digester. The first temperature control device may further include a high temperature thermal treatment unit, in which case the first temperature control device controls the micro temperature to maintain the temperature of the organic waste in the digester to maintain the activity of the anaerobic microorganisms. Can be maximized. When digestion tanks are maintained at the optimum temperature for the growth of anaerobic microorganisms, the decomposition rate of organic wastes is increased, and finally, the removal efficiency can be improved and rapid stabilization can be achieved. Therefore, in the case of including a high temperature thermal treatment unit as a previous step, when the fine temperature control range of the first temperature control device to 1 ℃ ~ 3 ℃ it is possible to increase the activity of the anaerobic microorganisms, improve the treatment efficiency, and stable treatment.

On the other hand, the outer tube tube 110 is provided with a vortex induction plate 130 and the first gas supply pipe 160 and the digester tank between the inner tube and the double tube tube 110 through the inner tube of the double tube 110. 2 gas supply pipe 170 is connected. Extinguishing gas is supplied into or out of the double tube pipe 110 through one of the first gas supply pipe 160 and the second gas supply pipe 170. The material of the double tube tube is generally made of stainless steel, which is preferable in consideration of manufacturing convenience, durability, corrosion resistance, and maximizing thermal efficiency.

The material of the vortex induction plate is made of one or more materials selected from stainless steel, PVC, high density polyethylene (PE), and fiber reinforced plastic (FPC), and the inclination angle is 10 to 50 degrees to further help in forming the vortex. The continuous vortex flow between the anaerobic digester inner wall and the double tube tube is optimized.

When the extinguishing gas flows in through the first gas supply pipe 160 and blocks the second gas supply pipe 170, as shown in FIG. 2, the extinguishing gas rises in the inner tube of the double tube pipe 110 to induce the flow of organic waste. The elevated organic waste flows out through the outer tube tube 110 and flows downward through the vortex induction plate 130 and finally flows into the inner tube of the double tube tube 110 and continuously circulates.

When the digestion gas flows in through the second gas supply pipe 170 and blocks the first gas supply pipe 160, the digestion gas rises between the inner wall of the digester and the double tube pipe 110 as shown in FIG. 1, and the vortex induction plate ( 130) to allow upward stirring.

In addition, the inner settling tank 210 provided at the upper end of the inner tube of the double tube tube 110, the digested sludge is settled to move down and the supernatant water is discharged to the outside through the supernatant outflow pipe 270 to increase the microbial residence time. To help.

On the other hand, the bottom of the double tube pipe 110 forms a circulation pipe 220 and the sludge control valve 230 to induce circulation and stirring of the bottom organic waste.

On the other hand, the outlet tube 250 is formed in the lower portion of the double tube tube 110, the double tube tube 110 to control the external outflow of the digestive sludge finished anaerobic digestion process in the inner tube and the exterior.

Figure 4 is a plan view for explaining the inlet water circulation pipe 260 of the flow path vortex type anaerobic digestion apparatus through gas alternating stirring according to the present invention. When the organic waste is introduced through the inlet pipe 100, the inlet water circulation pipe 260 is installed at the lower end of the double tube pipe 110 to generate vortices at the bottom of the digester. The second temperature control device is installed in the circulation pipe to maintain the anaerobic digester at the optimum temperature, and the second temperature control device adjusts the fine temperature to a range of 1 ° C. to 3 ° C.

Figure 5 is a view for explaining the internal settling tank 210 installed on the upper end of the inner tube of the double tube tube 110 of the flow passage vortex type anaerobic digestion apparatus through a gas shift in accordance with the present invention. The organic waste tank stays in the internal sedimentation tank 210 introduced through the internal sedimentation tank inlet 310 and then moves to the inner tube of the sedimented organic waste oil double tube pipe 110 and the supernatant is sent to the outside through the supernatant water outlet pipe 270. You lose.

As such, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: inlet pipe 110: double tube pipe
120: first temperature controller 130: vortex induction plate
140: first gas collection tube 150: second gas collection tube
160: first gas supply pipe 170: second gas supply pipe
180: gas compressor 190: first gas supply valve
200: second gas supply valve 210: internal settling tank
220: circulating pipe 230: sludge control valve
240: second temperature controller 250: outflow pipe
260: influent water circulation 270: supernatant outflow
300: wear 310: internal sedimentation tank inlet

Claims (6)

In the anaerobic digestion apparatus of organic waste,
A first temperature control device 120 for maintaining organic waste at an optimum temperature in the fire extinguishing device; And
An inlet pipe 100 through which the organic waste that has passed through the first temperature controller is introduced into the digester; And
A double tube pipe 110 serving as a heat exchanger at the same time as the inflow passage of the organic waste introduced from the outside through the inlet pipe; And
An inflow water circulation pipe 260 for allowing organic waste to vortex at the bottom of the digester at the bottom of the double tube pipe; And
A first gas supply pipe (160) and a second gas supply pipe (170) for re-injecting digestion gas into the digester for mutual reverse rotation in the digester; And
A vortex induction plate 130 for generating a vortex when the extinguishing gas is supplied to the first gas supply pipe and the second gas supply pipe in opposite directions; And
Internal settling tank 210 to increase the microbial residence time in the upper end of the digester and to discharge the supernatant; And
A circulation tube 220 capable of forcibly circulating and stirring the organic waste deposited on the bottom of the digester; And
And a second temperature control device 240 for adjusting a fine temperature to maintain a digester at an optimal temperature in the circulation pipe, including the first gas supply pipe or only one of the gas supply pipes of the second gas supply pipe. Anaerobic digestion apparatus, characterized in that the mutual reverse rotation by injecting. The method of claim 1,
The first thermostat is anaerobic digestion apparatus, characterized in that the thermal pretreatment unit may be further installed in front of the anaerobic digester. The anaerobic digestion apparatus according to claim 1, wherein the double tube tube is made of stainless steel. The method of claim 1,
Vortex guide plate is made of one or more materials selected from stainless steel, PVC, high-density polyethylene (PE), fiber-reinforced plastics (FPC), the inclination angle is 10 to 50 degrees, characterized in that the anaerobic fire extinguishing device. The method of claim 1,
The second temperature controller is anaerobic digestion apparatus, characterized in that for controlling the fine temperature in the range of 1 ℃ to 3 ℃. In the anaerobic digestion method of organic waste,
A first temperature control step (S1) for controlling the temperature of the organic waste to maintain the optimum temperature in the digester; And
Introducing the organic waste that has passed the first temperature control step into the digester (S2); And
Heat exchange of the organic waste introduced from the outside through a double tube (S3); And
Organic waste is vortexed at the bottom of the digester at the bottom of the double tube (S4); And
Re-injecting the digestion gas into the digester through any one of the first gas supply pipe or the second gas supply pipe for mutual reverse rotation in the digester (S5); And
Vortex generation step (S6) for generating a vortex when the re-injected digestion gas is supplied in a reverse direction to each other; And
Internal settling step (S7) to increase the microbial residence time at the upper end of the digester and to discharge the supernatant water; And
A circulation and stirring step (S8) capable of forcibly circulating and stirring the organic waste precipitated at the bottom of the digester; And
Analytical digestion method comprising a; second temperature control step (S9) for adjusting the fine temperature in the circulation and stirring step to maintain the digester at the optimum temperature.

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